Mode-Conditioning Patch Cable (MCP) is a special type of patch cable used in Gigabit Ethernet LANs.

This patch cable allows laser transmitters to operate at Gigabit rates over multimode fibre without being unduly limited by Differential Mode Delay (DMD) effect. This ensures an effective bandwidth for the system, closer to that measured by over-filled launch method. The purpose of Mode-Conditioning Patch Cables is to condition the launch to guarantee specific link lengths and it should be inserted on both ends of a link to interface between a single mode adapter card and a multimode backbone cable.